Finance Receivables And Loans, Net (Redefaults) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,744	1,795	4,831	5,030
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 22	$ 23	$ 59	$ 64
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	12	$ 12	33	$ 33
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 2		$ 2		$ 4
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1,742	1,790	4,822	5,020
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 21	$ 22	$ 58	$ 62
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 12	$ 12	$ 33	$ 33
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	5	9	10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 1	$ 1	$ 1	$ 2
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member] | Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0	$ 0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	$ 0	$ 0	$ 0	$ 0